首先是建構函式，過載

#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#define maxn 65540
using namespace std;

struct Node
{
    int x,y;
    Node (int x = 0,int y = 0):x(x),y(y) {}   //建構函式
};
Node operator + (const Node& a,const Node& b) 
{
    return Node(a.x+b.x,a.y+b.y);
}
ostream& operator << (ostream &out,const Node& p)  //過載流輸出方式
{
    out<<"("<<p.x<<","<<p.y<<")";
    return out;
}
int main()
{
    Node a,b(1,2);
    Node c = a+b;
    cout<<a+b<<endl;;
}